Guitar headstock



FIG. 1 is a front top perspective view of a guitar headstock showing my new design, the broken lines shown are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a top plan thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front end view thereof;

FIG. 5 is a rear end view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a guitar headstock, as shown and described. 